Wrench.



WB E N C H.

(Application filed Dec. 26,' 1899.)

(No Model.)

MTNESSES:

l INVENTOR e WM@ d" ma Noms v :rens co4. wow-umm WASHINGTON. n. c.

EZRA N. GIFFORD, OF CHICAGO, ILLINOIS, ASSIGNOR OF TWO-TI-IIRDS TO GEORGE R. GOTT,

OF SAME PLACE.

WRENCH.

SPECFICATION forming part of Letters Patent No. 655,900, dated August 14, 1900. Application tied December 26,1899. Seriana. 741,511. (Numtel.)

To (til whom, :it 'ln/ty concern:

Beit known that I, EZRA N. GIFFORD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,

have invented a new and useful Adjustable Wrench, of which the following is a specification.

My invention has reference to adjustable wrenches; and my object is to provide a construction which is not only simple and durable, but is adapted to being quickly adjusted to engage and firmly hold any-sized nut or bolt-head Within its capacity, as is described hereinafter,and illustrated in the accompanying drawings, in Whichi Figure l is a side elevatiomand Fig.2 a front elevation, of a wrench in which are embodied my improvements. Fig. 3 is a side elevation of the shank or handle of the Wrench, together with the stationary jaw. Fig. A is a bottom plan of the parts shown in Fig. 1. Fig. 5 shows respectively a side elevation and a plan of an eXteriorly-screw-threaded nut having a longitudinal axial hole therethrough. Fig. G shows respectively a side elevation and a plan of an eccentric shaft, upon which isV mounted the nut shown in Fig. 5.

Similar letters indicate like parts throughout the several views.

The shank or handle A terminates in the fixed jaw B, and at the front side of the shank is a series of teeth C. The movable jaw D is integral with a frame E, and through the latter the shank A is fitted to slide in a manner similar to what is shown in many ordinary adjustable wrenches. A portion of the frame' E is slotted transversely,and through the slot, parallel with the shank A, is mounted to revolve the eccentric shaft F, and upon the eccentric portion of shaft F, within the slot, is mounted the exteriorly-screw-threaded nut G, with the threads thereof usually in engagementwith the series of teeth C ofshank A. There i-s aportion of shaft F from F to F2 of one size and another portion from F3 to F4 of a size smaller than from F to F2, the end being screw-threaded, as indicated in Fig. 6. The

portions of shaft F from F to F2 and from F3 to F4 are concentric,while the portion between 5o F2 and F,3 is eccentric to the other portions.

In assembling the parts of this wrench, af-

ter the movable jaw is in position on shank A, as shown in Fig. l, the nut G is placed in position Within the transverse slot of the jawframe E, when the shaft F is inserted through its outer bearings in the frame and through the nut G. Then the inner end of the shaft is brought into engagement with the screwthreads in the frame and the shaft is screwed into position until the nut G has bearing only 6c upon the eccentric portion of the shaft between F2 and F3, Fig. 6, the screw-threaded portion of the shaft forming in this instance a longitudinally-shifting bearing. The pin H is now secured into the side of the shaft, when it Will serve as a stop to limit the rotation thereof by the pin being brought into contact with the shoulders I and .I on the frame E. Vhen shaft Fis turned to the right until pin H contacts shoulder J, Fig. 1, the 7o eccentric portionof the shaft is so relatively disposed that thescreW-threads of nut G are brought into engagement with the teeth C of shank A, when the movable jaw may be Vadjusted by rotating the nut; but should a quick adjustment be desired the shaft is turned until pin II is in contact with the lefthand shoulder I, Fig. 4, when the threads of nut G will be lifted from engagement with teeth C and leave the movable jaw and frame 8o free to bepslid to any position desired, Where the shaft F may be turned back to the position shown in Fig. 1 and the parts again lockedin position by the engagement of the threads of the nut with teeth C.;

The screw-threads on the small end of shaft F serve the double purpose of means to hold the shaft in position from falling out, and also on account of the contact of the shoulder at F2, Fig. 6, with nut G the mov- 9o able jaw is always tightened upon a nut by the action of the screw-threads in revolving the pin H over from a left to a right position into contact with shoulder J, when the parts are locked. By virtue of friction not only the shaft but the nut G is held in the adjusted position, caused by the action of the screw-threads at the end of the shaft.

I claim as my invention- In an adjustable Wrench having a stationloo ary jaw provided with a shank, and a movable opposing jaw mounted to slide on the shank, the shank provided With araek, a revoluole shaft having journals at each end portion which are mounted in bearings in the movable jaw, a portion of the shaft between the said journals eccentric to the axial centers of the journals and forming a shoulder at the outer journal, an exteriorlyscrewthreaded nut concentrically mounted upon the eccentric portion of the shaft against the said shoulder, the inner end journal of the shaft screw-threaded and in engagement with a screw-threaded bearing in the movable jaw whereby in revolving the shaft the nut is carried longitudinally by contact with the shoulder of the shaft, and inwardly into engagenient With the teeth of the rack, as and for the purpose hereinbefore stated.

EZRA N. GIFFORD.

Witnesses:

OSCAR SNELL, u H. H. HALE. 

